I recently read that in a neurotypical human being, the succession of two experiences only has a big impact on brain activity for the first experience, while the second makes a smaller spike. In psychotic patients on the other hand, the impression makes two equally large spikes both times. In the experiment, the experience was hearing a ballpoint pen click. So maybe being dulled to former experience is important for the brain to function properly, just a side effect of our natural brain filter.
Is it normal for a person to "feel" less as they get older?
I remember experiencing the world much more vividly when I was a little boy....